Transfering licence pro from a computer to a new computer

Hello, how can I transfer a licence pro from a computer to a new computer ?

eM Client - Help - License -> “Deactivate”.

If this is not possible e.g. because the computer is defective:

Register at https://licensemanager.emclient.com. (For “User group” enter “User”).
Go to “Licenses” - “Activations”.
Deactivate the license for the eM Client on the currently used computer.